Need help with regular expression

Hi, all! I try to use folowing regular expression: $out = preg_replace('#\{%%%.*?\{%bigfoto%\}.*?%%%\}#is','==REPLACEMENT==',$str); It not work as I need. Please tell me - what I do wrong? I have string: <tr><td>NAME:</td><td><input type="text" name="name" value="" size="80"/></td></tr> <tr><td>Foto:</td><td><input type="file" name="foto" value="{%foto%}" /> {%%%<br/><img alt="{%name%}" src="{%foto%}"/>%%%} </td></tr> <tr><td>Big foto:</td><td><input type="file" name="bigfoto" value="" /> {%%%<br/><img alt="{%name%}" src="{%bigfoto%}"/>%%%} </td></tr> I need result as: <tr><td>NAME:</td><td><input type="text" name="name" value="" size="80"/></td></tr> <tr><td>Foto:</td><td><input type="file" name="foto" value="{%foto%}" /> {%%%<br/><img alt="{%name%}" src="{%foto%}"/>%%%} </td></tr> ==REPLACEMENT== And I have this result: <tr><td>NAME:</td><td><input type="text" name="name" value="" size="80"/></td></tr> <tr><td>Foto:</td><td><input type="file" name="foto" value="{%foto%}" /> ==REPLACEMENT== </td></tr>